Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585444
Zhu Liu, Yilun Guo, F. Jolani, Yiqiang Yu, Z. Chen
The proposed designs are include in array of 1×2 resonators, the array of 2×2 resonators and the array of 3×3 resonators for magnetically-coupled resonance wireless power transfer (MCR-WPT) system. The arrays of WPT system provide high performance when the transmitter and the receiver are in misaligned positions in over-coupled and under-coupled situations. Also, we introduced a method for simulation and optimization of arrays of resonators WPT system. Finally, the array of 2×2 and 3×3 WPT system were successfully integrated into a charging table. These designs present good candidates for wireless power transfer applications.
{"title":"Planar magnetically-coupled resonance wireless power transfer systems using array of coil resonators","authors":"Zhu Liu, Yilun Guo, F. Jolani, Yiqiang Yu, Z. Chen","doi":"10.1109/IEEE-IWS.2016.7585444","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585444","url":null,"abstract":"The proposed designs are include in array of 1×2 resonators, the array of 2×2 resonators and the array of 3×3 resonators for magnetically-coupled resonance wireless power transfer (MCR-WPT) system. The arrays of WPT system provide high performance when the transmitter and the receiver are in misaligned positions in over-coupled and under-coupled situations. Also, we introduced a method for simulation and optimization of arrays of resonators WPT system. Finally, the array of 2×2 and 3×3 WPT system were successfully integrated into a charging table. These designs present good candidates for wireless power transfer applications.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133971811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585407
Liang Lin, Liang Zhou, Binghui Zhang, Gangfeng Wu, W. Yin, J. Mao
Some improvements in the design of LDMOSFET power amplifier (PA) are demonstrated for effectively suppressing metallic shielding cover (MSC) effects. The internal and outer matching structures on the PCB are at first simulated and optimized using the commercial full-wave software HFSS. Further, they are integrated with the lumped-element circuit model of die and co-simulated using the software ADS 2013. With an Automation Testing Bench employed, the input-output responses of the realized PA modules are measured and compared. An improved design of the LDMOSFET die is also presented and validated. This research can provide some useful guidelines for the development of PA modules with high performance.
{"title":"Some improvements in the design of LDMOSFET power amplifier for effectively suppressing metallic shielding cover (MSC) effects","authors":"Liang Lin, Liang Zhou, Binghui Zhang, Gangfeng Wu, W. Yin, J. Mao","doi":"10.1109/IEEE-IWS.2016.7585407","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585407","url":null,"abstract":"Some improvements in the design of LDMOSFET power amplifier (PA) are demonstrated for effectively suppressing metallic shielding cover (MSC) effects. The internal and outer matching structures on the PCB are at first simulated and optimized using the commercial full-wave software HFSS. Further, they are integrated with the lumped-element circuit model of die and co-simulated using the software ADS 2013. With an Automation Testing Bench employed, the input-output responses of the realized PA modules are measured and compared. An improved design of the LDMOSFET die is also presented and validated. This research can provide some useful guidelines for the development of PA modules with high performance.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132362480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585447
S. Huang, Lin He, Yu-Kai Chou, F. Lin
This paper presents an energy-efficient high-speed hybrid dynamic comparator with reduced delay in 40-nm CMOS process. The first dynamic amplifying stage uses PMOS input to reduce the common-mode voltage, thus the required minimum supply voltage, while enhancing the positive feedback to reduce the discharge time in a low-power manner. The second quasi-dynamic latching stage uses NMOS input to gain the transconductance, thus reducing the latch delay with negligible static power, while needing no additional clock signal. Simulation results show that the proposed comparator operates up to 6 GHz with 54-ps delay, while consuming only 288 μW at 1.1-V supply.
{"title":"A 288-μW 6-GHz hybrid dynamic comparator with 54-ps delay in 40-nm CMOS","authors":"S. Huang, Lin He, Yu-Kai Chou, F. Lin","doi":"10.1109/IEEE-IWS.2016.7585447","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585447","url":null,"abstract":"This paper presents an energy-efficient high-speed hybrid dynamic comparator with reduced delay in 40-nm CMOS process. The first dynamic amplifying stage uses PMOS input to reduce the common-mode voltage, thus the required minimum supply voltage, while enhancing the positive feedback to reduce the discharge time in a low-power manner. The second quasi-dynamic latching stage uses NMOS input to gain the transconductance, thus reducing the latch delay with negligible static power, while needing no additional clock signal. Simulation results show that the proposed comparator operates up to 6 GHz with 54-ps delay, while consuming only 288 μW at 1.1-V supply.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127638931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a method for estimating the distance between multiple IMU sensors in wearable devices applications. The procedure calibrates both differential orientation and differential position between two sensors frames, thereby enabling computation of the distance between wearable devices. As a result, the length of a rigid body can be determined for the application scenario when sensors are fixed on opposite ends of the rigid body.
{"title":"Method for estimating the distance between multiple IMU-based wearable devices","authors":"Haotian Xu, Chenghao Lyu, Yuhao Zhang, Yijing Xia, X. Wang, Patrick Yin Chiang","doi":"10.1109/IEEE-IWS.2016.7585477","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585477","url":null,"abstract":"This paper presents a method for estimating the distance between multiple IMU sensors in wearable devices applications. The procedure calibrates both differential orientation and differential position between two sensors frames, thereby enabling computation of the distance between wearable devices. As a result, the length of a rigid body can be determined for the application scenario when sensors are fixed on opposite ends of the rigid body.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114495899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585487
A. Buzdar, A. Buzdar, Hassan Bin Tila, Liguo Sun, Mehdi Khan, Usman Khan, Wahab Ferozv
A UWB Vivaldi array antenna has been designed on low cost FR4 substrate which is operational in the UWB band of 1.25-4 GHz with Su less than -10 dB with optimum performance in 2-3.5 GHz frequency band used in Through Wall Sensing (TWS) applications. The proposed Vivaldi antenna has been optimized with Ansoft HFSS for achieving compact size and optimum performance. The manufactured antenna array results have shown good parameters which are in line with simulation results.
{"title":"Low cost Vivaldi array antenna for mobile through wall sensing platforms","authors":"A. Buzdar, A. Buzdar, Hassan Bin Tila, Liguo Sun, Mehdi Khan, Usman Khan, Wahab Ferozv","doi":"10.1109/IEEE-IWS.2016.7585487","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585487","url":null,"abstract":"A UWB Vivaldi array antenna has been designed on low cost FR4 substrate which is operational in the UWB band of 1.25-4 GHz with Su less than -10 dB with optimum performance in 2-3.5 GHz frequency band used in Through Wall Sensing (TWS) applications. The proposed Vivaldi antenna has been optimized with Ansoft HFSS for achieving compact size and optimum performance. The manufactured antenna array results have shown good parameters which are in line with simulation results.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122119258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585416
Wen-Ji Liu, Binjie Hu, Zong-Heng Wei, Jiaoke Lv, Tuo Tan, Xing Liu
In order to handle the cross-tier and co-tier interference effectively for LTE-A two-tier heterogeneous network, we propose a CSGC algorithm based partial spectrum sharing scheme using cognitive radio (CR) technique. In this paper, Radio resources are divided into three parts: macro-dedicated part, shared part and femto-dedicated part. Simulation result shows that the proposed scheme not only solves the two-tier interference but also improves the performance of the edge users. Moreover, we can set the portion of the dedicated-spectrum to maximize the system benefit.
{"title":"A CSGC algorithm based partial spectrum sharing scheme in cognitive LTE-A two-tier heterogeneous networks","authors":"Wen-Ji Liu, Binjie Hu, Zong-Heng Wei, Jiaoke Lv, Tuo Tan, Xing Liu","doi":"10.1109/IEEE-IWS.2016.7585416","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585416","url":null,"abstract":"In order to handle the cross-tier and co-tier interference effectively for LTE-A two-tier heterogeneous network, we propose a CSGC algorithm based partial spectrum sharing scheme using cognitive radio (CR) technique. In this paper, Radio resources are divided into three parts: macro-dedicated part, shared part and femto-dedicated part. Simulation result shows that the proposed scheme not only solves the two-tier interference but also improves the performance of the edge users. Moreover, we can set the portion of the dedicated-spectrum to maximize the system benefit.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114903684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585426
Xiao-yu He, Lei Chang, Ling-Lu Chen
A multifunction broad-beam antenna is presented for dual bands and dual circular-polarizations applications. The proposed antenna consists of a crossed dipole antenna (CDA) and four inclined monopole antennas (IMAs). The CDA is connected to a slotted coaxial Balun and fed via an impedance transformer. The IMAs are fed via a 90° hybrid network with input phases of 0°, 90°, 180° and 270°, which locates at the bottom of the CDA. The proposed antenna combines the properties of CDA and IMAs in a shared aperture. The structure can be operated as a dual circularly polarized (CP) antenna covering dual bands with broad-beam. Experimental results show that the presented antenna performs left-handed CP (LHCP) radiation at 1.552-1.685 GHz with axial ratio (AR) <; 3 dB and VSWR <; 2 by CDA and right-hand CP (RHCp) radiation at 2.15-2.62 GHz & 2.84-3.32 GHz by IMAs (AR <; 3 dB, VSWR <; 2).
{"title":"A multifunction broad-beam antenna with dual bands and dual circular-polarizations","authors":"Xiao-yu He, Lei Chang, Ling-Lu Chen","doi":"10.1109/IEEE-IWS.2016.7585426","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585426","url":null,"abstract":"A multifunction broad-beam antenna is presented for dual bands and dual circular-polarizations applications. The proposed antenna consists of a crossed dipole antenna (CDA) and four inclined monopole antennas (IMAs). The CDA is connected to a slotted coaxial Balun and fed via an impedance transformer. The IMAs are fed via a 90° hybrid network with input phases of 0°, 90°, 180° and 270°, which locates at the bottom of the CDA. The proposed antenna combines the properties of CDA and IMAs in a shared aperture. The structure can be operated as a dual circularly polarized (CP) antenna covering dual bands with broad-beam. Experimental results show that the presented antenna performs left-handed CP (LHCP) radiation at 1.552-1.685 GHz with axial ratio (AR) <; 3 dB and VSWR <; 2 by CDA and right-hand CP (RHCp) radiation at 2.15-2.62 GHz & 2.84-3.32 GHz by IMAs (AR <; 3 dB, VSWR <; 2).","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129311048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585472
Huidong Liu, Jin Chen, Guoru Ding, T. Tsiftsis, C. Rowell
In this paper, a cooperative cognitive radio network (CRN) with energy harvesting capabilities of its secondary users is considered. Specifically, cooperative spectrum sensing and multi-antenna beamforming are employed to improve the sensing performance and the energy transfer efficiency, respectively. In our approach, a homogeneous CRN scenario is studied where the optimal sensing probability of each second user (SU) is obtained to maximize the control center (CC) throughput while satisfying the energy causality and primary user (PU) collision constraints. An iterative algorithm is proposed to obtain the optimal charging time. Numerical results depict that in an energy constrained scenario, cooperative spectrum sensing with beamforming performs much better than cooperative spectrum sensing without beamforming in terms of increased system throughput.
{"title":"Antenna beamforming for energy harvesting in cognitive radio networks","authors":"Huidong Liu, Jin Chen, Guoru Ding, T. Tsiftsis, C. Rowell","doi":"10.1109/IEEE-IWS.2016.7585472","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585472","url":null,"abstract":"In this paper, a cooperative cognitive radio network (CRN) with energy harvesting capabilities of its secondary users is considered. Specifically, cooperative spectrum sensing and multi-antenna beamforming are employed to improve the sensing performance and the energy transfer efficiency, respectively. In our approach, a homogeneous CRN scenario is studied where the optimal sensing probability of each second user (SU) is obtained to maximize the control center (CC) throughput while satisfying the energy causality and primary user (PU) collision constraints. An iterative algorithm is proposed to obtain the optimal charging time. Numerical results depict that in an energy constrained scenario, cooperative spectrum sensing with beamforming performs much better than cooperative spectrum sensing without beamforming in terms of increased system throughput.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133895125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585420
Jing Zhao, Bo Zhang, Xiaofeng Yang
A 25-30 GHz 6-bit digital attenuator with high accuracy and low insertion loss by 0.15μm GaAs PHEMT process is presented in this work. An improved structure with a parallel capacitor is applied in the attenuator architecture to enhance the attenuation accuracy. To reduce leakage of the RF signal, a cascade structure is proposed to enhance isolation and compensate the insertion loss simultaneously. The On-wafer measurement results show that the 6-bit GaAs digital attenuator has 0.5 dB resolution and 31.5 dB dynamic attenuation rage while the return loss is better than -10 dB for all states; the attenuation accuracy is better than 0.5 dB while the RMS attenuation error is less than 0.21 dB; The insertion loss is less than 5.7 dB while the insertion phase shift is less than -6.0° The total chip size is 2.0mm × 1.0mm.
{"title":"A 25–30 GHz 6-bit digital attenuator with high accuracy and low insertion loss","authors":"Jing Zhao, Bo Zhang, Xiaofeng Yang","doi":"10.1109/IEEE-IWS.2016.7585420","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585420","url":null,"abstract":"A 25-30 GHz 6-bit digital attenuator with high accuracy and low insertion loss by 0.15μm GaAs PHEMT process is presented in this work. An improved structure with a parallel capacitor is applied in the attenuator architecture to enhance the attenuation accuracy. To reduce leakage of the RF signal, a cascade structure is proposed to enhance isolation and compensate the insertion loss simultaneously. The On-wafer measurement results show that the 6-bit GaAs digital attenuator has 0.5 dB resolution and 31.5 dB dynamic attenuation rage while the return loss is better than -10 dB for all states; the attenuation accuracy is better than 0.5 dB while the RMS attenuation error is less than 0.21 dB; The insertion loss is less than 5.7 dB while the insertion phase shift is less than -6.0° The total chip size is 2.0mm × 1.0mm.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130942282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585424
Wenwen Yang, Jianyi Zhou, Ke Zhou, Zhiqiang Yu, W. Qin, Jian‐Xin Chen
In this paper, a 1×8 active antenna array based on frequency shiftable vector modulator (FSVM) module is demonstrated. The FSVM module can flexibly shift the operating frequency band of the vector modulator (VM) while not deteriorating the signal performance. By employing the FSVM module, a 1×8 active antenna array with a RF path beamforming structure is developed. Since the magnitude and phase of the RF signal in each transceiver can be adjusted independently through the FSVM module, the radiation pattern of the array is controllable. For the verification of the proposed active antenna array, a prototype operating at 2.6 GHz band is fabricated and measured. Measured results show that the RF signal performance almost remains the same before and after entering the FSVM module. Furthermore, the active antenna array is capable of steering the main beam from -50° to 50° with a gain fluctuation less than 1.5 dB and a beam position error better than 0.5°.
{"title":"An active antenna array based on frequency shiftable vector modulator module","authors":"Wenwen Yang, Jianyi Zhou, Ke Zhou, Zhiqiang Yu, W. Qin, Jian‐Xin Chen","doi":"10.1109/IEEE-IWS.2016.7585424","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585424","url":null,"abstract":"In this paper, a 1×8 active antenna array based on frequency shiftable vector modulator (FSVM) module is demonstrated. The FSVM module can flexibly shift the operating frequency band of the vector modulator (VM) while not deteriorating the signal performance. By employing the FSVM module, a 1×8 active antenna array with a RF path beamforming structure is developed. Since the magnitude and phase of the RF signal in each transceiver can be adjusted independently through the FSVM module, the radiation pattern of the array is controllable. For the verification of the proposed active antenna array, a prototype operating at 2.6 GHz band is fabricated and measured. Measured results show that the RF signal performance almost remains the same before and after entering the FSVM module. Furthermore, the active antenna array is capable of steering the main beam from -50° to 50° with a gain fluctuation less than 1.5 dB and a beam position error better than 0.5°.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134245171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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